Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Fractional isolation and physico-chemical characterization of alkali-soluble polysaccharides from sugar beet pulp
Autore:
Sun, RC; Hughes, S;
Indirizzi:
Univ Coll N Wales, Biocomposites Ctr, Bangor LL57 2UW, Gwynedd, Wales UnivColl N Wales Bangor Gwynedd Wales LL57 2UW LL57 2UW, Gwynedd, Wales
Titolo Testata:
CARBOHYDRATE POLYMERS
fascicolo: 3, volume: 38, anno: 1999,
pagine: 273 - 281
SICI:
0144-8617(199903)38:3<273:FIAPCO>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
WHEAT-STRAW; CELL-WALLS; FERULOYLATED OLIGOSACCHARIDES; PECTIC SUBSTANCES; FERULIC ACID; EXTRACTION; SPECTROSCOPY;
Keywords:
hemicellulose-ligin complex; pectin; sugar beet pulp; alkali-soluble polysaccharides; sugars; p-coumaric acid; ferulic acid; molecular weight;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Physical, Chemical & Earth Sciences
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Sun, RC Univ Coll N Wales, Biocomposites Ctr, Bangor LL57 2UW, Gwynedd, Wales Univ Coll N Wales Bangor Gwynedd Wales LL57 2UW W, Gwynedd, Wales
Citazione:
R.C. Sun e S. Hughes, "Fractional isolation and physico-chemical characterization of alkali-soluble polysaccharides from sugar beet pulp", CARBOHY POL, 38(3), 1999, pp. 273-281

Abstract

Pectin rich polysaccharide fractions were extracted with 2% sodium hydroxide at 45 degrees C for 0.5, 1, 2, 3, 4 and 5 h, respectively, from sugar beet pulp. The neutral sugar rich polysaccharide preparations were obtained by treatment of the alkali extracts with pectinase. The pectin rich alkali-soluble polysaccharide-lignin complexes contained 36.7%-46.7% galacturonic acid, 13.7%-16.0% neutral sugars, 9.2%-14.8% protein, 3.6%-9.1% lignin and 18.9%-22.9% ash. The hemicellulose-lignin complex preparations were composedmainly of neutral sugars, in which galactose, rhamnose and arabinose were detected as the major sugar constituents. The weight-average molecular weights of the alkali-soluble polysaccharide-lignin complex fractions (38400-184900 Da) were much higher than those of the hemicellulose-lignin complex preparations (21100-26400 Da). The acetyl groups and methyl esters were foundto be fully saponified during the alkali treatments, while feruloyl and p-coumaroyl esters appeared to be more resistant to the alkali conditions. Besides ferulic and p-coumaric acids, six other phenols were also firstly identified in the nitrobenzene oxidation products from all the isolated 12 fractions. These findings indicated that coumaryl, coniferyl and sinapyl alcohols are tightly associated with hemicelluloses and pectin in sugar beet pulp cell walls. (C) 1999 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 19:34:38